Outer circle grinding tool for universal shaft pin under A320 aircraft landing gear

Abstract

The utility model discloses an A320 aircraft landing gear lower universal shaft pin excircle grinding tool, which comprises a connecting seat, a cross beam, a positioning pin and an adjusting screw rod, the connecting seat comprises two flat plates which are oppositely arranged, a limiting space is formed between the two flat plates, one ends of the two flat plates are connected together through a connecting part, one surface of the connecting part is provided with a second inclined surface, and the other surface of the connecting part is provided with a third inclined surface. A first threaded hole is formed in the second inclined surface, a clamping part is arranged behind the connecting part, the positioning pin is arranged in the limiting space in a penetrating mode and used for being arranged in a connecting hole of a lower universal shaft pin in a penetrating mode, the cross beam is installed at the positions, away from the second inclined surface, of the two flat plates, a second threaded hole is formed in the cross beam, and third threaded holes are formed in the two flat plates correspondingly; the first threaded hole, the second threaded hole and the third threaded hole are in threaded connection with adjusting screw rods respectively. The auxiliary device can assist in reliably installing the lower universal shaft pin of the A320 aircraft landing gear on the grinding machine, and the axis of the lower universal shaft pin can be consistent with the axis of the grinding machine through adjustment.

Description

Technical Field

[0001] The utility model relates to a grinding tool for aircraft parts, in particular to an outer cylindrical grinding tool for a universal shaft pin under an A320 aircraft landing gear. Background Art

[0002] Aircraft landing gear needs to bear the corresponding loads when the aircraft takes off, lands and parks on the ground, so after a certain number of take-offs and landings, the landing gear needs to be overhauled. The lower universal shaft pin is a key component of the aircraft landing gear. During the overhaul process, when the outer chrome layer of the lower universal shaft pin is found to have defects, it needs to be repaired in depth according to the requirements of the CMM manual, that is, the chrome layer on the outer surface of the lower universal shaft pin needs to be removed, and then the chrome layer is re-plated, and the chrome layer is ground with an external cylindrical grinder to restore it to the designed size to meet the repair requirements.

[0003] like Figure 5 The figure shows the structure of the universal joint pin 500 under the landing gear of the A320 aircraft. Its appearance and structure are relatively special. Its main body is cylindrical, and one end of the main body is provided with a connecting head 501 inclined to one side, and a first inclined surface 503 is formed on the inclined connecting head 501. The end of the connecting head 501 away from the main body is provided with a connecting hole 502.

[0004] Since the connector 501 of the universal joint pin of the A320 aircraft landing gear is tilted to one side, the lower universal joint pin 500 cannot be directly processed using a double center clamp. It is difficult to adjust the center axis of the lower universal joint pin during grinding on a grinder, which can easily cause deviations, making it difficult for the shape and position tolerances of the lower universal joint pin after grinding to meet the CMM requirements. Utility Model Content

[0005] The utility model aims to provide an external cylindrical grinding tool for the universal shaft pin of the A320 aircraft landing gear, which can assist in reliably installing the universal shaft pin of the A320 aircraft landing gear on a grinding machine and can make the axis of the lower universal shaft pin consistent with the axis of the grinding machine through adjustment.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] A cylindrical grinding tool for the universal joint pin of the A320 aircraft landing gear, characterized in that it includes a connecting seat, a crossbeam, a locating pin and an adjusting screw, the connecting seat includes two flat plates arranged opposite to each other, a limiting space is formed between the two flat plates, one ends of the two flat plates are connected together through a connecting portion, a side of the connecting portion located in the limiting space is provided with a second inclined surface for cooperating and abutting against the first inclined surface of the lower universal joint pin, a first threaded hole penetrating the connecting portion is provided on the second inclined surface, the first threaded hole is perpendicular to the second inclined surface, a clamping portion for connecting to a four-jaw chuck of a grinding machine spindle is provided at the rear of the connecting portion, the locating pin is penetrated in the limiting space and is used to penetrate in the connecting hole of the lower universal joint pin, the crossbeam is installed at a position of the two flat plates away from the second inclined surface, a second threaded hole is provided on the crossbeam, and third threaded holes are respectively provided on the two flat plates, and adjusting screws are respectively threadedly connected in the first threaded hole, the second threaded hole and the third threaded hole.

[0008] Furthermore, a protrusion is provided on a side of the connection portion away from the second inclined surface, a third inclined surface parallel to the second inclined surface is provided on the protrusion, and the outer end of the first threaded hole is located on the third inclined surface.

[0009] Furthermore, two ends of the crossbeam are respectively provided with bending parts extending vertically to one side, the bending parts are fixedly connected to the two flat plates by bolts, and the second threaded hole is provided in the middle of the crossbeam.

[0010] Furthermore, the outer side surfaces of the two flat plates at positions away from the second inclined surface are respectively provided with limiting notches, and the bent portions are fitted into the limiting notches.

[0011] Furthermore, the two flat plates are respectively provided with round holes, and the positioning pins pass through the round holes.

[0012] Furthermore, the fit between the locating pin and the circular hole is a transition fit.

[0013] Furthermore, a flange is provided at one end of the positioning pin, and the flange is fixed to the side surface of the corresponding flat plate by bolts.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] (1) The utility model can be fixedly connected to the connecting head of the lower universal shaft pin through the cooperation of the connecting seat, the crossbeam and the positioning pin. By mounting the connecting seat fixing clamp on the four-jaw chuck of the main shaft of the grinder, the lower universal shaft pin with a relatively special appearance structure can be reliably installed on the grinder. After installation, the position of the lower universal shaft pin can be fine-tuned and locked by rotating the adjustment screws in the first threaded hole, the second threaded hole and the third threaded hole, so that the axis of the lower universal shaft pin is consistent with the axis of the grinder, thereby ensuring the grinding quality of the lower universal shaft pin, achieving uniform thickness of the ground chromium layer, and the outer cylindrical surface size of the lower universal shaft pin after grinding meets the requirements.

[0016] (2) After the lower universal joint pin is ground with the aid of the external cylindrical grinding tool of the utility model, the surface roughness, external cylindrical size, roundness, straightness, etc. of the lower universal joint pin can meet the repair requirements of the CMM manual. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is one of the three-dimensional schematic diagrams of the cylindrical grinding tooling of the utility model;

[0018] Figure 2 This is the second three-dimensional schematic diagram of the cylindrical grinding tool of the utility model;

[0019] Figure 3 This is the third three-dimensional schematic diagram of the cylindrical grinding tool of the utility model;

[0020] Figure 4 This is the fourth three-dimensional schematic diagram of the cylindrical grinding tool of the utility model;

[0021] Figure 5 It is a schematic diagram of the structure of the universal joint pin under the landing gear of the A320 aircraft.

[0022] Meaning of reference numerals in the figure:

[0023] 100-connecting seat; 101-flat plate; 102-connecting part; 103-bump; 104-third inclined plane; 105-first threaded hole; 106-third threaded hole; 107-limiting notch; 108-clamping part; 109-second inclined plane; 110-round hole; 200-crossbeam; 201-second threaded hole; 202-bending part; 300-locating pin; 301-flange; 400-limiting space; 500-lower universal joint pin; 501-connecting head; 502-connecting hole; 503-first inclined plane. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with embodiments.

[0025] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0028] Example:

[0029] like Figures 1 to 4 The figure shows the cylindrical grinding tool of the A320 aircraft landing gear lower universal shaft pin of this embodiment, which includes a connecting seat 100, a cross beam 200, a positioning pin 300 and an adjusting screw (the adjusting screw is not shown in the figure). The connecting seat 100, the cross beam 200, the positioning pin 300 and the adjusting screw are made of #45 steel, and the material hardness is lower than the material hardness of the lower universal shaft pin, so as to avoid scratching the lower universal shaft pin.

[0030] The connection seat 100 is integrally formed, and includes two plates 101 arranged opposite to each other, and a limiting space 400 is formed between the two plates 101, and the limiting space 400 is used to limit the connection head 501 of the lower universal shaft pin 500. One end of the two plates 101 is connected together through a connection portion 102, and a second inclined surface 109 is provided on one side of the connection portion 102 located in the limiting space 400 for cooperating with and abutting against the first inclined surface 503 of the lower universal shaft pin 500, and the second inclined surface 109 and the first inclined surface 503 are relatively abutted together during installation. A first threaded hole 105 penetrating through the connection portion 102 is provided on the second inclined surface 109, and the first threaded hole 105 is perpendicular to the second inclined surface 109. A convex block 103 is provided on one side of the connection portion 102 away from the second inclined surface 109, and a third inclined surface 104 parallel to the second inclined surface 109 is provided on the convex block 103, and the outer end of the first threaded hole 105 is located on the third inclined surface 104. An adjusting screw is threadedly connected in the first threaded hole 105 . During installation, the inner end of the adjusting screw will abut against the first inclined surface 503 of the lower universal joint pin 500 . By rotating the adjusting screw, the fixing position of the lower universal joint pin 500 can be fine-tuned.

[0031] A clamping portion 108 is disposed behind the connecting portion 102. The clamping portion 108 is used to connect to a four-jaw chuck of a grinding machine spindle. The clamping portion 108 is square and has four clamping surfaces. Figure 3The four positions A, B, C, and D shown are the clamping positions of the four jaws of the four-jaw chuck.

[0032] The two plates 101 are respectively provided with round holes 110 , and the round holes 110 on the two plates 101 are aligned with each other. The positioning pin 300 passes through the round holes 110 and passes through the limiting space 400 . During installation, the positioning pin 300 is used to pass through the connecting hole 502 of the lower universal shaft pin 500 .

[0033] The cooperation between the positioning pin 300 and the circular hole 110 of this embodiment is a transitional cooperation, so that the installation is more stable. A flange 301 is provided at one end of the positioning pin 300, and the flange 301 is fixed on the side of the corresponding flat plate 101 by three bolts.

[0034] Limiting notches 107 are respectively provided on the outer side surfaces of the two flat plates 101 away from the second inclined surface 109. Both ends of the crossbeam 200 are respectively provided with bending portions 202 extending vertically to one side. The bending portions 202 are fitted into the limiting notches 107 and fixedly connected by bolts.

[0035] A second threaded hole 201 is provided in the middle of the crossbeam 200, and an adjusting screw is threadedly connected in the second threaded hole 201. During installation, the inner end of the adjusting screw in the second threaded hole 201 will abut against the connecting head 501 of the lower universal joint pin 500, and the abutting position is the surface of the lower universal joint pin 500 that is relatively away from the first inclined surface 503. By rotating the adjusting screw in the second threaded hole 201, the position of the lower universal joint pin 500 can be fine-tuned.

[0036] The two plates 101 are respectively provided with third threaded holes 106, and adjusting screws are respectively threadedly connected in the third threaded holes 106. During installation, the inner ends of the adjusting screws in the third threaded holes 106 will abut against the two side surfaces of the connecting head 501 of the lower universal shaft pin 500, and the position of the lower universal shaft pin 500 can be finely adjusted by rotating the adjusting screws in the third threaded holes 106.

[0037] From the overall perspective, the adjusting screws in the first threaded hole 105, the second threaded hole 201 and the two third threaded holes 106 are respectively pressed against the upper, lower, left and right positions of the connecting head 501 of the lower universal joint pin 500, thereby achieving fine-tuning and locking of the lower universal joint pin 500, and ultimately making the axis of the lower universal joint pin 500 consistent with the axis of the grinder.

[0038] The use of the cylindrical grinding tool in this embodiment is as follows:

[0039] The connecting seat 100 is fixed on the four-jaw chuck of the grinder spindle through the clamping part 108, and the connecting head 501 of the lower universal joint pin 500 is placed in the limit space 400 accordingly, and the connecting hole 502 of the lower universal joint pin 500 is aligned with the circular hole 110 on the flat plate 101, and the first inclined surface 503 of the connecting head 501 of the lower universal joint pin 500 is abutted against the second inclined surface 109, and then the positioning pin 300 is inserted, and the positioning pin 300 is fixed by bolts, and then the crossbeam 200 is fixedly installed on the connecting seat 100, and the adjusting screws are respectively connected to the first threaded hole 105, the second threaded hole 201 and the two third threaded holes 106, and the inner ends of the adjusting screws are respectively against the upper, lower, left and right positions of the connecting head 501 of the lower universal joint pin 500, and the adjusting screws are rotated to fine-tune the fixed position of the lower universal joint pin 500, so that the axis of the lower universal joint pin 500 is consistent with the axis of the grinder, and then the adjusting screws are locked. After fixing the lower universal joint pin 500 on the four-jaw chuck, use the movable center on the grinder to support the end face of the lower universal joint pin 500 away from the four-jaw chuck, use the dial indicator to align the clamped lower universal joint pin 500, adjust it to a machinable state, and finally carry out reliable processing.

[0040] The above-mentioned embodiments of the utility model are not intended to limit the protection scope of the utility model, and the implementation methods of the utility model are not limited to these. All other various forms of modifications, replacements or changes made to the above-mentioned structure of the utility model based on the above-mentioned contents of the utility model, in accordance with the common technical knowledge and customary means in the field, without departing from the above-mentioned basic technical ideas of the utility model, should fall within the protection scope of the utility model.

Claims

1. An external cylindrical grinding tool for the universal joint pin under the landing gear of an A320 aircraft, characterized in that: The cam is an assembly made of a plurality of movable parts, each of which is adapted to move the movable part into and out of the groove on the movement of the movable part so as to prevent the movable part from moving upwards and downwards.

2. The cylindrical grinding tool for the universal joint pin of the A320 aircraft landing gear according to claim 1 is characterized in that: A convex block is provided on a side of the connecting portion away from the second inclined surface, a third inclined surface parallel to the second inclined surface is provided on the convex block, and an outer end of the first threaded hole is located on the third inclined surface.

3. The cylindrical grinding tool for the universal joint pin of the A320 aircraft landing gear according to claim 1 is characterized in that: Both ends of the crossbeam are respectively provided with bending parts extending vertically to one side, the bending parts are fixedly connected to the two flat plates by bolts, and the second threaded hole is arranged in the middle of the crossbeam.

4. The cylindrical grinding tool for the universal joint pin of the A320 aircraft landing gear according to claim 3 is characterized in that: The outer side surfaces of the two flat plates at positions away from the second inclined surface are respectively provided with limiting notches, and the bent portions are fitted into the limiting notches.

5. The cylindrical grinding tool for the universal joint pin of the A320 aircraft landing gear according to claim 1 is characterized in that: The two flat plates are respectively provided with round holes, and the positioning pins are passed through the round holes.

6. The cylindrical grinding tool for the universal joint pin of the A320 aircraft landing gear according to claim 5, characterized in that: The cooperation between the positioning pin and the circular hole is a transition cooperation.

7. The cylindrical grinding tool for the universal joint pin of the A320 aircraft landing gear according to claim 5, characterized in that: A flange is provided at one end of the positioning pin, and the flange is fixed on the side surface of the corresponding flat plate by bolts.

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